Power-hammer



(No Model.)

H. VIGNBAULT.

Patented Apr. 13; 1897.

H Vge mJKM/k 3J y X f H( i v v Attorneys.

SPAVTEN OFFICE.

I-IERCULE VIGNEAULT, OF VORCESTER, MASSACHUSETTS.

POWER-HAM NI ER.

SPECIFICATION forming part of Letters Patent No. 580,629, dated April 13, 1897. Application ned November 4, 1896. serai No. 611,056. (No model.)

.To all wir/ont t may concern.-

Be it known that I, HERCULE VIGNEAULT, a subject of the Queen of England, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Improvement in Power-Hammers, of which the following is a specification.

My invention relates to an improved formof power-hammer.

The especial objects of my invention are to arrange the dies of a power-hammer to allow free access thereto from three sides, to construct the dies so that they may be used for drawing out hoops or tires, and to provide an improved form of iiexible connection between the movable ram and its crank-pin for allowing the necessary lost motion when the ram encounters a heavy resistance.

To these ends myinvention consists of the parts and combinations of parts, as hereinafter described,and more particularly pointed out in the claims at the end of this specification.

In the accompanying drawings, Figure 1 is aside view, partially broken away, of a powerhammer constructed according to my invention. Fig. 2 is a front view of the same. Fig. 3 is a partial front view, the parts being illustrated in a different relative position. Fig. 4 is a detail sectional View illustrating the flexible connection which I preferably employ, and Fig. 5 is a perspective view illustrating the dies.

In constructing a power-hammer according to my invention I preferably use a substantially plain pedestal or frame which is free from projections or angles which would interfere in any way with the free access to the dies from three sides thereof.

The dies themselves which I preferably use are provided with flat engaging surfaces and with semicylindrical projections which extend beyond the front face of the machine, so that a hoop or tire may be readily worked thereby.

As far as possible I have dispensed with all projecting bolts or nuts on the moving parts of the machine7 so as to do away with all moving projections which would be liable to catch upon the work or which would be a source of danger to the user.

A flexible connection between the movable ram and its crank-pin constructed according to my invention consists, essentially, of a flexible loop, the parts of said connection being arranged so that both sides of the loop will assist in raising the ram and so that the sides of the loop may be separated to allow lost motion when the ram encounters a heavy resistance. j

Referring to the drawings and in detail, A designates a main pedestal or casting, which is provided with a transverse hole a to allow access to the rear face of the dies or the introduction of water thereto when desired.

A driving-shaft 10 is journaled in the upper part of the pedestal A. Secured on the rear end of the driving-shaft 10 is a pulley l1, which is counterbalanced or made solid, as

at 12, so as to normally hold the movable ram 7o in a raised posit-ion. Fastened on the front end of the driving-shaft 10 is a disk 13. Fitted into the disk 13 is a movable block 14, which can be shifted or adjusted by means of a screw 15. The movable block 14 carries a crank- 75 pin 1G. Threaded onto the crank-pin 16 and engaging a clamping-sleeve 17 (shown in section in Fig. 4) is a clamping-nut 1S. The movable ram 19 is mounted in ways at the front of the pedestal A in the ordinary Inan- 8o -ner.

A two-part connecting-rod 2O is pivotally connected to the movable ram 19 by means of a stud or screw 2l. The stud or screw 21 is preferably countersunk into the ram 19, so as to be substantially flush with the face thereof, and is provided with a recess or wrench-socket. A turnbuckle 22 of ordinary construction may be used to adjust the length of the two-part connecting-rod 20.

Secured upon the upper end of the two-part 9o connecting-rod is a piece 23. Normally open spring-arms 24 and 25 are socketed into and pivotally connected to the piece 23. The tension of the spring-arms 24 and 25 can be adjusted by means of set-screws 26. ers 27 are j ournaled in the upper ends of the spring-arms 24 and 25. A yoke-piece 28 is journaled on the crank-pin 16 outside of its sleeve 17. A strap 29, which may be made of leather or other flexible material, forms a Ioo loop extending around the rollers 27, the ends of the strap being secured to the yoke-piece 28. By means of this construction it will be seen that the leather strap forms a loop con- Small rollpin will bebroughtinto engagement with-the,

upper side of ihe loop and that both branches of the loop will assist in raising the ram. When the crank-pin is moving doWn,the tendencywill be forv the sides ofi the-loop to separate, and the downward pull w-ill' be Aexerted only upon'fthelower side-ofthe loop.A It thus-- will: be seen that IA haveprovideda iiexible connection for power-hammers which willact" more p ositively'orv stronglyy in raisingorlift-Y ing the ram than-it doesin forcing the same down, which is an extremely desirablepoint in practice. It `willalso belseen that by employingaconnection in thef'orm of aloop the spring-armsfwill need to have only acomparatively slightmotion toward or away from each other, asv each spring-arm will let out twice the length of'strap-comparedwith the d-istance through. which it moves.

The form of; dies preferably employedis mosticlearlyillustratedin Fig. 5. Thestationary-die 30 i`s dovetailed intoor' secured inthe pedestal A and the movable die'l is carried by the-ram 19. videdwith flat` substantially rectangular engaging surfaces S2` and with semicylindrical projections 33, which extend somewhaty beyond the front, face-of the machine,- thus per-V mitting themto beused in workingwagontires or similar hoops.

I am aware that-changes may be made in the construction of my power-hammer by thosewho are skilled'in the art, and that parts of myinvention maybeused in different locations and indifferent combinations withoutdeparting from -thegscope of my invention as expressedin thefclaims. IA do notwish,

therefore, to be limited to theformwhich Il have shownand described; but

What Il doclaim, and desire tol securerby Letters Patent of the United States,- is- 1. In apower-hammer, the combination of and a connection between the ram and operating m eans constructed and arranged to yieldl stanti-ally as described.

These dies are pro--v a movableram,acrank-pin for-.actuating the ram, and. a connection comprising aV iiexible loop, the parts being arranged so that both sides of the loop will assist in raising the ram, and so that the sides of the loop may be separated .to allow lostmotion when the ram encounters resistances on its downstroke, substantially as described.

3. In. a power-hammer, the combination of a movable ram, a crank-pin for actuating the ram, and a connection comprising a yokez piece j our-naled. onthe crank-pin,.normally open spring-arms, and a strap forming a loop having its under side connected to the yokepiece, whereby both sides of the loop will assist in raising the-ram', and sothatrthesides of theVV loop may' be separated toY allow lost motion when the ram encounters resistance on its downstro'ke, substantially as described.

4. Ina power-hammer,Vtliecombination ofv ay movableram, a connectingrod` pivotally connected thereto,normally open Vspring-arms car-riedbysaid connecting-rod, means'for adjusting the tension of said spring-arms-,a driving-shaft, a disk secured'thereom va crank-pin .adjustablymounted in said disk, ayokefj'ournal'ed onasaidcrank-pin, and a strap'forming a-loop'connectingthe upperends of the springarms,` the lends ofy said: strap being vsecured'to the yoke, substantially as described'.

5. In a'power-hammer,I the'combination of movable ram 19, an two-part connecting-'rod 20,a .turnbuckle122fforadjustingthe length of the connecting-rod;` a piece spring-arms `24;- and" 25` soc'keted'- into and pivotally connected to thepiece'23, rollersQ''f'journaled in the spring-arms, a disk 13, a crank-pin 16',

and a flexible strap passing around the rollers 27,' the. ends ofthe strapbeingjconne'cted to thecrank-pin, substantially as1described;

6; In apower.-hammer,uthe combination ofr a pedestalor frame, a stationary die, a movable ram, a A die secured thereto, saidv dies being providedfwith- Iiat engaging surfaces land vsemicyflindrical proj ections-'which extend beyond the-front:` face ofthe machine, means for operating the ram, and a connection between the rain and operating means; constructed and arranged to yieldy more readily to resistances encounteredon the downstroke offthe ram-than toresistances encountered on. the-upstroke thereof, ysubstantially as described'. a movable ram, vmeansfor operating the ram,

In testimony whereofv I have hereunto set my hand in the presence of' twosubscribing 1 witnesses. more readily to resistances encounteredon the downstroke of the ram than to resistances encountered on the upstroke thereof, sub- HERGULE.A VIGNEAULT.

Witnesses:

LoUIs W. SOUTHGATE, PHILIP W. SOUTHGATE.

IOO

IIO 

